instructions a -- POP -> Pops a byte off the stack POPw -> Pops a word off the stack POPx -> Pops a byte off the stack to x POPxw -> Pops a word off the stack to xw POPy -> Pops a byte off the stack to y POPyw -> Pops a word off the stack to yw POPxy -> Pops a byte off the stack to x and y POPxyw -> Pops a word off the stack to xw and yw